Hasil untuk "Science (General)"

Moritz J.S. Jochum, Frédéric S. Singa-Niatou, Crickette Sanz et al.

Transmission of human respiratory pathogens to wild, human-habituated great apes has been repeatedly documented within research and tourism projects. While the implementation of hygiene measures has significantly reduced the risk of pathogen introduction, vigilant surveillance remains essential to evaluate the effectiveness of the adopted measures and identify additional steps for risk reduction. Here, we combined behavioral observations and pathogen genomic surveillance in non-invasive samples to investigate three outbreaks of respiratory disease in human-habituated western lowland gorillas (Gorilla gorilla gorilla) across four sites within the Sangha Trinational Protected Area Network in the northwestern Congo Basin. Clinical signs of respiratory disease were recorded in three groups of monitored gorillas at two neighboring National Parks in the Central African Republic and Republic of Congo. Human respiratory syncytial viruses were identified as the causative agent for all three documented outbreaks. Genomic analyses revealed two distinct viral types suggesting independent introduction rather than intergroup transmission. All symptomatic individuals recovered. These findings highlight the importance of stringent prevention measures at great ape research sites and the need for addressing the burden of respiratory disease in neighboring human communities. The evolving integrated approach centered on the One Health concept in the Sangha Trinational Protected Area Network is proving beneficial to great ape conservation, the preservation of this high-biodiversity landscape and the public health of local communities.

Ryan Harries, Cornelia Lawson, Philip Shapira

This paper examines the impact of Generative Artificial Intelligence (GenAI) on scientific practices, conducting a qualitative review of selected literature to explore its applications, benefits, and challenges. The review draws on the OpenAlex publication database, using a Boolean search approach to identify scientific literature related to GenAI (including large language models and ChatGPT). Thirty-nine highly cited papers and commentaries are reviewed and qualitatively coded. Results are categorized by GenAI applications in science, scientific writing, medical practice, and education and training. The analysis finds that while there is a rapid adoption of GenAI in science and science practice, its long-term implications remain unclear, with ongoing uncertainties about its use and governance. The study provides early insights into GenAI's growing role in science and identifies questions for future research in this evolving field.

A Akmam, Serli Ahzari, E Emiliannur et al.

This experimental study investigates the effectiveness of the Cognitive Conflict-Based Generative Learning Model (GLBCC) in enhancing science literacy among high school physics students. The novelty of this research lies in the innovative integration of cognitive conflict strategies with generative learning principles through a six stage structured framework, specifically designed to address persistent misconceptions in physics education while systematically developing scientific literacy competencies. The research employed pretest-posttest control group design involving 167 Grade XI students from three schools. Students were randomly assigned to experimental groups (n = 83) that received GLBCC instruction and control groups (n = 84) that used the expository learning model. Science literacy was measured using validated instruments assessing scientific knowledge, inquiry processes, and application skills across six key indicators. Statistical analysis using ANOVA with Tukey HSD post-hoc tests revealed significant improvements in science literacy scores for students receiving GLBCC instruction compared to traditional methods (p < 0.001). This study makes a unique contribution to physics education by demonstrating how the deliberate creation of cognitive conflict, combined with authentic real-world physics phenomena, can effectively restructure students conceptual understanding and enhance their scientific thinking capabilities. Factor analysis identified four critical implementation factors: science literacy development components, learning stages and orientation, and objectives, and knowledge construction processes. The findings provide empirical evidence supporting the integration of cognitive conflict strategies with generative learning approaches in physics education, offering practical implications

Svetlana S. Konnova, Pavel A. Lepilin, Anastasia A. Zanishevskaya et al.

Biosensor technologies in medicine, as in many other areas, are replacing labor-intensive methods of monitoring human health. This paper presents the results of experimental studies on label-free sensors based on a hollow core microstructured optical waveguide (HC-MOW) for human blood serum analysis. The MOWs with a hollow core of 247.5 µm in diameter were manufactured and used in our work. These parameters allow the hollow core to be filled with high-viscosity solutions due to the capillary properties of the fiber. Calculations of the spectral properties of the HC-MOW fiber were carried out and experimentally confirmed. Twenty-one blood serum samples from volunteers were analyzed using standard photometry (commercial kits) and an experimental biosensor. The obtained transmission spectra were processed by the principal component analysis method and conclusions were drawn about the possibility of using this biosensor in point-of-care medicine. A significant difference was shown between the blood serum of healthy patients and patients with confirmed diagnoses and a long history of cardiovascular system abnormalities. Algorithms for spectra processing using the Origin program are presented.

Anna Carolyna Gianlorenço, Paulo Eduardo Portes Teixeira, Valton Costa et al.

<b>Background/Objectives:</b> Speech and motor control share overlapping neural mechanisms, yet their quantitative relationships in Parkinson’s disease (PD) remain underexplored. This study investigated bidirectional associations between acoustic voice features and objective motor metrics to better understand how vocal and motor systems relate in PD. <b>Methods:</b> Cross-sectional baseline data from participants in a randomized neuromodulation trial were analyzed (n = 13). Motor performance was captured using an Integrated Motion Analysis Suite (IMAS), which enabled quantitative, objective characterization of motor performance during balance, gait, and upper- and lower-limb tasks. Acoustic analyses included harmonic-to-noise ratio (HNR), smoothed cepstral peak prominence (CPPS), jitter, shimmer, median fundamental frequency (F0), F0 standard deviation (SD F0), and voice intensity. Univariate linear regressions were conducted in both directions (voice ↔ motor), as well as partial correlations controlling for PD motor symptom severity. <b>Results:</b> When modeling voice outcomes, faster motor performance and shorter movement durations were associated with acoustically clearer voice features (e.g., higher elbow flexion-extension peak speed with higher voice HNR, β = 8.5, R² = 0.56, <i>p</i> = 0.01). Similarly, when modeling motor outcomes, clearer voice measures were linked with faster movement speed and shorter movement durations (e.g., higher voice HNR with higher peak movement speed in elbow flexion/extension, β = 0.07, R² = 0.56, <i>p</i> = 0.01). <b>Conclusions:</b> Voice and motor measures in PD showed significant bidirectional associations, suggesting shared sensorimotor control. These exploratory findings, while limited by sample size, support the feasibility of integrated multimodal assessment for future longitudinal studies.

Anna Wajs-Bonikowska, Ewa Maciejczyk, Łukasz Szoka et al.

This study investigates the essential oil (EO) isolated from the seeds and cones of Canadian hemlock (<i>Tsuga canadensis</i>), highlighting notable differences in their chemical composition and biological activities. The seed EO was uniquely dominated by oxygenated derivatives of monoterpene hydrocarbons, particularly bornyl acetate (40%), whereas the cone EO exhibited higher levels of monoterpene hydrocarbons such as α-pinene (23%), β-pinene (20%), and myrcene (23%). A significant finding was the strong cytotoxic activity of cone EO against melanoma cell lines, with IC₅₀ values as low as 0.104 ± 0.015 μL/mL, compared to the minimal effects of seed EO. Additionally, cone EO demonstrated stronger antimicrobial activity, with lower minimum inhibitory concentrations (MICs) against Gram-positive and Gram-negative bacteria, further highlighting its therapeutic potential. Lipophilic extracts from seeds were characterized by unsaturated fatty acids (linoleic, oleic, and sciadonic acids—specific to conifers) and bioactive molecules with high antioxidant and nutritional potential, such as β-tocopherol, β-sitosterol, and campestrol. These findings underscore the unique chemical composition of <i>T. canadensis</i> seed EO and its lipophilic extract, along with the potent cytotoxic and antimicrobial properties of cone EO, offering insights into their potential applications in natural products for pharmaceutical and therapeutic uses.

Suvijak Untaaveesup, MD, Thipsukon Amnartpanich, MD, Noraworn Jirattikanwong, MD et al.

Background: Chronic systemic inflammation in individuals with moderate-to-severe atopic dermatitis (AD) potentially predisposes them to metabolic and cardiovascular diseases. Nevertheless, evidence with regard to such association is limited. Objective: To assess the association between metabolic and cardiovascular outcomes and moderate-to-severe AD. Methods: A systematic search was performed through PubMed, Scopus, EMBASE, and Cochrane for population-based studies that addressed the effects of moderate-to-severe AD on metabolic and cardiovascular outcomes compared with the general population from inception to August 31, 2023. Meta-analysis was performed using the random effects model. The pooled odds ratio (OR) and certainty of evidence for each outcome were reported. Results: We included 11 studies, 4 retrospective cohorts, 1 prospective cohort, 4 cross-sectional, and 2 case-control studies involving 405,170 moderate-to-severe AD patients compared to 4,591,478 unaffected controls. Moderate-to-severe AD was associated with a higher risk of myocardial infarction with an OR (95% CI) of 1.33 (1.07, 1.65), angina 1.33 (1.06, 1.66), heart failure 1.56 (1.28, 1.90), stroke 1.45 (1.21, 1.74), hypertension 1.38 (1.18, 1.63), dyslipidemia 1.27 (1.15, 1.41), and metabolic syndrome 1.24 (1.05, 1.42) with very low certainty of evidence. No significantly increased risk of cardiovascular death with an odds ratio (95% CI) of 1.81 (0.96, 3.44) and diabetes of 1.24 (0.91, 1.68) was observed. High heterogeneity was observed in most studies for all of the outcomes. Conclusion: Our meta-analysis demonstrated a modest but significant association between moderate-to-severe AD and increased susceptibility to metabolic and cardiovascular diseases. Initial assessment of cardiovascular and metabolic risk for patients with moderate-to-severe AD should be considered to enable early management strategies.

Tesfaye Tadesse, Yericho Berhanu, Ginjo Gitima et al.

Land use and cover changes alter the functions and structures of ecosystem, resulting in variations in Ecosystem Service Values (ESVs). Thus, we examined the impacts of land use/land cover (LULC) changes on ESVs from 1992 to 2052 using geospatial technologies. The Landsat images were classified using the supervised maximum likelihood classification technique, and future changes in LULC were predicted using the CA-Markov model. Ecosystem Service Values coefficients were adopted from empirical studies and ESVs changes were evaluated based on the benefit transfer method using LULC data for the study periods, with their corresponding modified ESVs coefficients. The results revealed that, the proportions of grassland, forestland and shrubland declined by 58.5 %, 48.15 % and 33.48 %, respectively, from 1992 to 2022. Simultaneously, the highest rate of expansions of waterbodies (34 times), farmland and settlement threefold as well as bareland (60.2 %) from 1992 to 2022 was noticed. As a result, decreasing trends were experienced in the total ESVs of the district from US$33.6 million in 1992 to US$27.79 million in 2022, and are anticipated to further decline to US$25.94 million in 2052. The ESVs of forestland, shrubland and grassland shrank from 53.1 %, 40 % and 2.78 % in 1992 to 33.28 %, 33.16 % and 1.4 % in 2022 these changes are anticipated to continue for the next three decades, except trend for the increase in grassland ecosystem service value. Therefore, the government should redesign effective land management strategies to alleviate the negative consequences of LULC changes, facilitate payment for ecosystem services, and design ecotourism to boost the income of residents for major land use management-based production systems to increase the ESV in the district.

Yassin Nurahmed Ebrahim

White mango scale (WMS) Aulacaspis tubercularis Newstead (Hemiptera: Diaspididae) is a polyphagous armored scale insect which is considered one of the key pests of mango (Mangifera indica L.) around the world. Mango is widely grown in Ethiopia whereas its production is challenged by WMS in the last decade. Effective formulations that could help manage the scale as part of IPM practice were sought from field experiments at Seka mango farm, Ethiopia in 2019 and 2020 seasons. The study aimed to evaluate the efficacy of some formulations against WMS on mango trees. Randomized complete block designs with three replications were used for the experiments and each tree served as a plot. Allocation of each treatment within each replication was done randomly. The treatments were applied sequentially three times at 14 days interval using motorized Knapsack sprayer coinciding with peak period of natural infestation. Scale numbers before and after each spray were counted using a microscope with LCD. Sum of live crawler, female and male was registered as WMS count data. Results showed that dimethoate, diazinon, imidacloprid &amp; λ-cyhalothrin sprayed alone; dimethoate rotated with imidacloprid &amp; λ-cyhalothrin, chlorpyrifos-ethyl rotated with paraffin, and diazinon rotated with azadirachtin, caused total mortality of the scales. The results also showed that, chlorpyrifos-ethyl, deltamethrin, paraffin oil and λ-cyhalothrin sprayed alone caused percent reduction with range 83–95 % in both seasons. Hence, the study revealed that dimethoate, diazinon, imidacloprid &amp; λ-cyhalothrin applied individually, dimethoate rotated with imidacloprid &amp; λ-cyhalothrin, chlorpyrifos-ethyl rotated with paraffin and diazinon rotated with azadirachtin fully protect mango trees from WMS and significantly superior to other treatments. Therefore, chemical control of A. tubercularis may consider the use of these materials as foliar application and can be used as components for integrated pest management plans for WMS. However, application in the form of rotation is preferred to the alone spray as the former could substantially reduce the likelihood of inducing pesticide resistance. Cost implications and effects of the products on the natural enemy and residual toxicity in fruits need to be studied.

Taishi Yazawa, Kenn Joshua Geroy Rubite, Princess Eden Macabata-Rubite

This research conducted a citizen scientific field investigation and water quality assessment of nine major rivers using only on-site equipment and a smartphone in the Province of Antique, Philippines. Potential issues concerning water resources management in the province were discussed with local governors and citizens while conducting the water sampling and on-site measurement. The results of water quality assessments revealed that some of the rivers have experienced high turbidity, caused by anthropogenic activities such as embankment, sand mining, and dredging. In highly populated basins, such as the Sibalom and Malandog Rivers, a high biochemical oxygen demand level (>7 mg/L) was confirmed by the water quality analysis using an iPhone. Since high consumption of groundwater has already affected the lives of people in the province, surface water usage shifting from groundwater, involving the construction of a facility treating physical and chemical parameters, is needed. The citizen scientific approach employed in this research can provide more realistic insights into local environmental concerns, which would not be possible through quantitative measurements of water quality. HIGHLIGHTS The water quality of nine major rivers was assessed in the Province of Antique, Philippines.; Citizen scientific field investigation and water quality analysis used only an iPhone and an on-site water quality meter.; Some rivers have experienced siltation caused by anthropogenic activities.; A high biochemical oxygen demand level was confirmed in highly populated basins.; There is a need for a shift from groundwater to surface water usage.;

Shichao Huang, Jing Zhang, Yu He et al.

Aiming at the problem that power load data are stochastic and that it is difficult to obtain accurate forecasting results by a single algorithm, in this paper, a combined forecasting method for short-term power load was proposed based on the Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN)-sample entropy (SE), the BP neural network (BPNN), and the Transformer model. Firstly, the power load data were decomposed into several power load subsequences with obvious complexity differences by using the CEEMDAN-SE. Then, BPNN and Transformer model were used to forecast the subsequences with low complexity and the subsequences with high complexity, respectively. Finally, the forecasting results of each subsequence were superimposed to obtain the final forecasting result. The simulation was taken from our proposed model and six forecasting models by using the load dataset from a certain area of Spain. The results showed that the MAPE of our proposed CEEMDAN-SE-BPNN-Transformer model was 1.1317%, while the RMSE was 304.40, which was better than the selected six forecasting models.

Ram Sagar

Astronomy and Astrophysics is an observational science dealing with celestial objects. Aryabhatta Research Institute of Observational Sciences (ARIES) is one of the premier institutions in astronomy and astrophysics and has contributed significantly in this field. No doubt, India is a part of several mega-science projects in the domain of Astronomy and Astrophysics, such as the Thirty Meter Telescope (TMT); Square Kilometer Array (SKA) and Laser Interferometer Gravitational-wave Observatory (LIGO) projects. Growing engagement of India with mega-science projects has brought a positive impact on its science and technology landscape. A few such collaborations are mentioned to demonstrate that international cooperation are necessary in the field of Astrophysical sciences.

Xiang Tang, Guoqing Liu, Li Lin et al.

Abstract Background Neurodevelopmental disorder with absent language and variable seizures (NEDALVS, # 618707) are characterized by delayed speech and motor development, ocular abnormalities, and seizures. NEDAVLS is an autosomal dominant disorder caused by de novo mutations in the wasp protein family member 1 (WASF1) gene. Case presentation We identified a de novo nonsense variant c.1516 C > T (p.Arg506*) of WASF1 gene (NM_003931.3) in two pediatric female patients with delayed motor and language development. Conclusion This case demonstrates the effective role of WES in the diagnosis of NEDALVS. To the best of our knowledge, this variant has not been reported in the Chinese population. This contributes to our further understanding of the disease and to research related to the genetic and clinical heterogeneity, the treatment and prognosis of the disease.

Paras Mani Acharya, Panu Thainiramit, Kuaanan Techato et al.

Ever increasing anthropogenic pressures and natural threats to freshwater ecosystems are impacting global biodiversity. Otters are an indicator species that have an important role in maintaining the integrity and stability of wetland ecosystems. A lack of information on essential variables of otter ecology in the Himalaya range, including suitable potential habitat and site occupancy, hampers otter conservation. In this study, we analyze the geographic range, habitat suitability, and landscape connectivity for the smooth-coated otter (Lutrogale perspicillata) in lowland areas of Nepal. Using 655 presence points collected between 2010 and 2018, we created habitat suitability models using an ensemble of small models (ESMs) derived from MaxEnt techniques to understand the variables influencing smooth-coated otter distribution in the country. The model predicted the distribution of smooth-coated otters with high accuracy (AUC = 0.89 ± 0.03, Boyce’s Index = 0.95 ± 0.02). The model identified distance to water, precipitation in the driest month, Normalized Difference Vegetation Index, precipitation in the warmest quarter, and precipitation in the driest quarter, as the top five weighted variables that highly influenced the habitat suitability of smooth-coated otters, and identified 12 core areas with 14 potential connectivity linkages in only 2374 km2 of highly suitable habitat in Nepal. Importantly, suitable habitat was found to be highly concentrated in protected areas, particularly in Bardia and Shuklaphanta National Parks, having the only significant permeability of linkages between these core areas. All seven provinces had very small amounts of highly suitable habitat, likely due to the low abundance of natural freshwater lakes and aquaculture ponds, with the exception of Sudurpaschim Province, with only 19.82%, and Lumbini Province, with 5.18%, of highly suitable habitat. While accounting for little land area, the aquaculture ponds may provide important prey sources for otters, and consequently may create conflict with local farmers in the future. Appropriate management intervention, including habitat restoration, the integration of otter conservation strategies into wetland policies, specifically in the Ramsar site management plans, are urgently needed for the survival of the species in Nepal.

Jenny G. Sorce, Antonino Troja, Isaac Tutusaus

With the immense number of images, data, and sources that Euclid will deliver, the consortium will be in a unique position to create/provide/construct legacy catalogues. The latter will have exquisite imaging quality and good near-infrared spectroscopy, with impact on many areas of galaxy science. These proceedings review the prospects and scientific output that Euclid will be able to achieve in areas of galaxy and active galactic nucleus (AGN) evolution, the local and primeval Universe, studies of the Milky Way and stellar populations, supernovae (SN) and transients, Solar System objects, exoplanets, strong lensing and galaxy clusters.

Keisuke Okamura

Recent decades have witnessed a dramatic shift in the cross-border collaboration mode of researchers, with countries increasingly cooperating and competing with one another. It is crucial for leaders in academia and policy to understand the full extent of international research collaboration, their country's position within it, and its evolution over time. However, evidence for such world-scale dynamism is still scarce. This paper provides unique evidence of how international collaboration clusters have formed and evolved over the past 50 years across various scientific publications, using data from OpenAlex, a large-scale Open Bibliometrics platform launched in 2022. We first examine how the global presence of top-tier countries has changed in 15 natural science disciplines over time, as measured by publication volumes and international collaboration rates. Notably, we observe that the US and China have been rapidly moving closer together for decades but began moving apart after 2019. We then perform a hierarchical clustering to analyse and visualise the international collaboration clusters for each discipline and period. Finally, we provide quantitative evidence of a `Shrinking World' of research collaboration at a global scale over the past half-century. Our results provide valuable insights into the big picture of past, present and future international collaboration.

LIU Peng, LIU Bo, ZHOU Na-qin, PENG Xin-yi, LIN Wei-wei

In the context of data explosion,traditional cloud computing is faced with the dilemma of insufficient local cloud resources and high expansion cost.However,the newly emerging hybrid cloud combining resource-rich public cloud and data-sensitive private cloud has become a research hotspot and application direction at present.As an attractive paradigm,workflow has been increasing in data scale and computing scale.Therefore,workflow scheduling is a key issue in the direction of hybrid cloud research.For this reason,this paper first makes an in-depth investigation and analysis of workflow scheduling technology in hybrid cloud environment,and then classifies and compares workflow scheduling in hybrid cloud environment:for deadline,for cost,for energy-efficient and for multi-objective constraints.On this basis,the future research directions of workflow scheduling in hybrid cloud environment are analyzed and summarized:workflow scheduling based on Serverless platform,workflow scheduling based on edge server network collaboration,cloud native workflow scheduling based on Argo integration,and workflow scheduling based on fog computing fusion.

K. Castro-Morales, A. Canning, S. Arzberger et al.

<p>Large amounts of methane (<span class="inline-formula">CH₄</span>) could be released as a result of the gradual or abrupt thawing of Arctic permafrost due to global warming. Once available, this potent greenhouse gas is emitted into the atmosphere or transported laterally into aquatic ecosystems via hydrologic connectivity at the surface or via groundwaters. While high northern latitudes contribute up to 5 % of total global <span class="inline-formula">CH₄</span> emissions, the specific contribution of Arctic rivers and streams is largely unknown. We analyzed high-resolution continuous <span class="inline-formula">CH₄</span> concentrations measured between 15 and 17 June 2019 (late freshet) in a <span class="inline-formula">∼120</span> km transect of the Kolyma River in northeast Siberia. The average partial pressure of <span class="inline-formula">CH₄</span> (<span class="inline-formula"><i>p</i>CH₄</span>) in tributaries (66.8–206.8 <span class="inline-formula">µatm</span>) was 2–7 times higher than in the main river channel (28.3 <span class="inline-formula">µatm</span>). In the main channel, <span class="inline-formula">CH₄</span> was up to 1600 % supersaturated with respect to atmospheric equilibrium. Key sites along the riverbank and at tributary confluences accounted for 10 % of the navigated transect and had the highest <span class="inline-formula"><i>p</i>CH₄</span> (41 <span class="inline-formula">±</span> 7 <span class="inline-formula">µatm</span>) and <span class="inline-formula">CH₄</span> emissions (0.03 <span class="inline-formula">±</span> 0.004 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M15" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">mmol</mi><mspace linebreak="nobreak" width="0.125em"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="67pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="d4c2ee668fea12b7ca233e9f97025a6f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-19-5059-2022-ie00001.svg" width="67pt" height="13pt" src="bg-19-5059-2022-ie00001.png"/></svg:svg></span></span>) compared to other sites in the main channel, contributing between 14 % to 17 % of the total <span class="inline-formula">CH₄</span> flux in the transect. These key sites were characterized by warm waters (<span class="inline-formula"><i>T</i>&gt;14.5</span> <span class="inline-formula">^∘C</span>) and low specific conductivities (<span class="inline-formula"><i>κ</i>&lt;88</span> <span class="inline-formula">µS cm⁻¹</span>). The distribution of <span class="inline-formula">CH₄</span> in the river could be linked statistically to <span class="inline-formula"><i>T</i></span> and <span class="inline-formula"><i>κ</i></span> of the water and to their proximity to the shore <span class="inline-formula"><i>z</i></span>, and these parameters served as predictors of <span class="inline-formula">CH₄</span> concentrations in unsampled river areas. The abundance of <span class="inline-formula">CH₄</span>-consuming bacteria and <span class="inline-formula">CH₄</span>-producing archaea in the river was similar to those previously detected in nearby soils and was also strongly correlated to <span class="inline-formula"><i>T</i></span> and <span class="inline-formula"><i>κ</i></span>. These findings imply that the source of riverine <span class="inline-formula">CH₄</span> is closely related with sites near land. The average total <span class="inline-formula">CH₄</span> flux density in the river section was 0.02 <span class="inline-formula">±</span> 0.006 <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M33" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><mi mathvariant="normal">mmol</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">2</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">d</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="67pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="bc30a35f2d41fc21c297cb749b759172"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-19-5059-2022-ie00002.svg" width="67pt" height="13pt" src="bg-19-5059-2022-ie00002.png"/></svg:svg></span></span>, equivalent to an annual <span class="inline-formula">CH₄</span> flux of <span class="inline-formula">1.24×10⁷</span> <span class="inline-formula">g CH₄ yr⁻¹</span> emitted during a 146 d open water season. Our study highlights the importance of high-resolution continuous <span class="inline-formula">CH₄</span> measurements in Arctic rivers for identifying spatial and temporal variations, as well as providing a glimpse of the magnitude of riverine <span class="inline-formula">CH₄</span> emissions in the Arctic and their potential relevance to regional <span class="inline-formula">CH₄</span> budgets.</p>

Kawsar Hossen, Kaori Ozaki, Toshiaki Teruya et al.

The global population is increasing day by day. To meet the food demand for such a huge number of people, crop production must increase without damaging the environment, and to prevent synthetic chemical herbicides from polluting the environment, controlling weeds using bioherbicides is essential. Accordingly, using phytotoxic substances obtained from plants for biological weed management has attracted attention. The plant <i>Albizia richardiana</i> possesses phytotoxic compounds that have been previously recorded. Hence, we have conducted this research to characterize more phytotoxic compounds in <i>Albizia richardiana</i>. Aqueous methanolic extracts of <i>Albizia richardiana</i> plant significantly restricted the growth of the examined plants lettuce and Italian ryegrass in a species- and concentration-dependent manner. Three active phytotoxic compounds were isolated through various chromatographic methods and identified as compound <b>1</b>, <b>2</b>, and <b>3</b>. Compound <b>3</b> exhibited stronger phytotoxic potentials than the other two compounds and significantly suppressed the growth of <i>Lepidium sativum</i> (cress). The concentration of the compounds required for 50% growth reduction (I₅₀ value) of the <i>Lepidium sativum</i> seedlings ranged between 0.0827 to 0.4133 mg/mL. The results suggest that these three phytotoxic compounds might contribute to the allelopathic potential of <i>Albizia richardiana</i>.

Heidi B. Hammel, Stefanie N. Milam

Astrophysics facilities have been of tremendous importance for planetary science. The flagship space observatory Hubble Space Telescope has produced ground-breaking Solar System science, but when launched it did not even have the capability to track moving targets. The next astrophysics flagship mission, the James Webb Space Telescope, included Solar System scientists in its science team from the earliest days, with the result that Webb will launch with a diverse program and capabilities for Solar System exploration. The New Great Observatories, as well as future ground-based facilities, offer the opportunity for a robust suite of observations that will complement, enhance, and enable future Solar System exploration. We encourage the Planetary Science and Astrobiology Decadal Survey to overtly acknowledge the prospects for excellent Solar System science with the next generation of astrophysics facilities. We hope the Planetary Decadal will further encourage these missions to continue to formally involve Solar System scientists in the science working groups and development teams.